<p>Look for qualified this usages in the same class.</p>
<p>Examples:</p>
<pre>
    Positive example 1：
    /**
     * @author caikang
     * @date 2017/04/07
     */
    public class RandomInThread extends Thread {
        private Random random = new Random();
        @Override
        public void run() {
            long t = random.nextLong();
        }
    }
        ]]>
    </example>
    <example>
            <![CDATA[
    Positive example 2：
    /**
     * @author caikang
     * @date 2017/04/07
     */
    public class RandomInThread extends Thread {
        private Random random = ThreadLocalRandom.current();
        @Override
        public void run() {
            long t = random.nextLong();
        }
    }
</pre>